Samuel montgomery



(NoMod eL) s. MONTGOMERY,

WOOD SCREW.

1%. 294,255. Patented Feb. 26, 1884.

UNITED STATES PATENT OFFICE.

sAMUnL MONTGOMERY, or new YORK, n. Y.

WOOD- SCREW.

SPEOIFICATIOIT'forming part of Letters Patent No, 294,255, dated February 26, 1884.

Application filed October 24,1885. (No model.)

To all whom it may concern:

Be it known that I, SAMUEL MONTGOMERY. of New York city, county of New York, and State of New York, have invented certain new and useful Improvements in Wood-Screws, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, and to the letters of refer-' ence marked thereon.

My invention has relation to screws intended to be driven into woodwholly or partly-by turning them with a suitable implement, and these are ordinarily called woodscrews, to distinguish them from other screws intended only for use in connection with metal.

The object of my invention is to produce an article which may be driven into wood for a considerable distance, after the manner of anordinary French or other nail, and which may be then turned in for the remainder of its length like the ordinary wood-screw, which improved article shall possess all the holding qualities of the screw, be much more easily and quickly inserted or driven, be lighter and cheaper than the ordinary screw, less liable to split the wood into which driven, and more quickly and easily withdrawn than the ordinary screw. To accomplish all of this my improvements involve certain novel and useful peculiarities of construction and arrangement of the parts, all of which will be herein first fully described, and then pointed out in the claim.

In the accompanying drawings, forming part of this specification, Figure 1 is a vertical axial section, and Fig. 2 an elevation, of a wood-screw constructed according to my invention and involving my improvements.

Like letters of reference indicate corresponding parts in both figures.

The lower part of the article, from (t to b, is preferably made cylindrical, after the manner of French nails, and provided with a point to facilitate its being driven into wood. This cylindrical form is less liable to split the wood than the other forms; but other shapes might be given this part, it being only necessary that it be plain, like a nail.

The head of the improved screw is represented at 0, being inclinedvor beveled, asare the heads of ordinary wood-screws, and provided with the usual slot, d, or equivalent means for facilitating the application of a screw-driver. Immediately below the head is the ,threaded part c, gradually swelling up from its union with the cylindrical partuntil threads upon e are preferably cut so that the spaces between them, orthe lands, are deepest at top, and gradually grow less deep until the lower extremity of the threads is reached. These cuts between the threads preferably extend in to about the depth of the line of the plain part; but they may be otherwise out, if desired. The screw, being so constructed, is driven by the hammer until the screw-threads reach the wood, and the driving is then completed with the screwdriver.

To withdraw this improved screw it has only to be unturned slightly, when it may be pulled out quickly with the claw-hammer, avoiding the continuous turning heretofore re quired at the expense of time.

The peculiar advantages of the screw will be apparent in applying hinges, casters, &c., to fuiniture, and for all uses to which the ordinary wood-screw is generally applicable, es-' pecially in cases where it is desired to drive the screw without checking or splitting the wood in its application to all hard woods, and

it rapidly.

culiarly strong, while the lower part is light, effecting a considerable saving in weight of metal without detracting from the strength of the screw. The threads, being adjacent to the head and following in after the plain part, draw the head into the wood. When it is required that it be sunken in, and when used for securing trimmings or fittings of hardware, the strongest bearing is at or near the heada material advantage over the ordinary woodscrew, which has a plain part adjacent to the head and the weakest hold upon the wood at the part where in such cases it should be strongest.

W'hen constructed as above set forth, the improved screw will be found in practice to admirably answer the purpose or object of the invention as previously set forth.

Having now fully described my lnvention,

The upper part of the improved screw is pe it joins with the lower part of the head. The

in cases where it may be desired to withdraw what I claim as new, and desire to secure by I In testimony thatlclaim the foregoingIhavc Letters Patent, is hereunto set my hand in the presence of two The herein-described wood-screw, composed witnesses. of the heed athreaded portion adjacent there- SAMUEL MONTGOMERY. 5 to, and a cylindrical'or plain portion, pointed Witnesses:

as explained, substantially as shown and dc- WM. J. VVORLEY; scribed.- I WM. A. CHARTERS. 

